fn main() {
    // Array: fixed-size collection
    // Defines an array of type i32 with capacity 9, Then fill it with 0
    let mut arr:[i32; 9] = [0; 9];
    arr[1] = 1;
    arr[2] = 2;

    // iter arr
    for x in &arr {
        print!("{} ", x);
    }
    println!();
}
